This is a Conklin All American Green Etched Self Filling Rubber Sack Pen c1936. This 5 inch long model also came in Red Etched celluloid and sold for $1.95 with a $1.00 matching twist action pencil. Both the clip and lever are stamped with their patent numbers. The standard gold nib is plain and stamped only with ALL AMERICAN, unlike the Cushon Point 14 karat gold nib shown here. The barrel imprint reads ALL-AMERICAN over A PRODUCT OF CONKLIN over TOLEDO, OH U.S.A.